Hazardusって危険てこと。北京のPM2.5情報。 RT @BeijingAir: 10-28-2013 03:00; PM2.5; 318.0; 368; Hazardous (at 24-hour exposure at this level)
10-28-2013 03:00; PM2.5; 318.0; 368; Hazardous (at 24-hour exposure at this level)
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